No.23 A/C Does Not Work Sufficiently: Notes
DESCRIPTION & POSSIBLE CAUSE
| 23 |
A/C DOES NOT WORK SUFFICIENTLY |
| DESCRIPTION |
- A/C compressor magnetic clutch does not engage when A/C switch is turned on.
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| POSSIBLE CAUSE |
- PCM, instrument cluster or climate control unit DTC is stored
- Refrigerant pressure sensor malfunction
- Improper refrigerant charging amount
- Seized A/C compressor
- Evaporator temperature sensor malfunction
- Open or short circuit in wiring harness between the following terminals:
- Evaporator temperature sensor terminal B-Climate control unit terminal H (vehicles with manual air conditioner)
- Evaporator temperature sensor terminal A-Climate control unit terminal F (vehicles with manual air conditioner)
- Evaporator temperature sensor terminal B-Climate control unit terminal 1F (vehicles with full-auto air conditioner)
- Evaporator temperature sensor terminal A-Climate control unit terminal 1X (vehicles with full-auto air conditioner)
- Instrument cluster malfunction (Does not receive A/C request signal from climate control unit or transmit it to PCM)
- Climate control unit malfunction (A/C switch malfunction or climate control unit does not determine A/C request or transmit A/C request signal)
- Open circuit in wiring harness between magnetic clutch and body ground
- A/C relay stuck open
- Open circuit in wiring harness between the following terminals:
- Front body control module (FBCM) terminal 1C-A/C relay terminal A
- Battery positive terminal-A/C relay terminal C
- A/C relay terminal D-Magnetic clutch terminal A
- A/C relay terminal E-PCM terminal 2AF
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CAUTION:
- Verify the malfunction symptom according to not only the PID value but also the symptom troubleshooting.
RELATED PIDs DESCRIPTION
| Monitor item (Definition) |
Unit/Condition |
Condition/Specification (Reference) |
| AC_REQ |
OFF/ON |
- A/C switch OFF: Off
- A/C switch ON: On
|
| ACCS |
OFF/ON |
- A/C relay is OFF: Off
- A/C relay is ON: On
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